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Interplay Between Membrane Composition and Structural Stability of Membrane-Bound hIAPP.

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Human islet amyloid polypeptide (hIAPP), linked to type 2 diabetes, adopts different structures when interacting with lipid membranes. Membrane composition significantly influences hIAPP

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Amyloid aggregates are hallmarks of diseases like Alzheimer's, Parkinson's, and type 2 diabetes.
  • Intrinsically disordered proteins (IDPs), such as human islet amyloid polypeptide (hIAPP), are often involved in amyloid formation.
  • hIAPP is implicated in pancreatic beta-cell death, a key factor in type 2 diabetes pathogenesis.

Purpose of the Study:

  • To investigate the conformational changes of full-length hIAPP monomer induced by lipid bilayers.
  • To understand how different lipid bilayer compositions affect the equilibrium ensemble of hIAPP.
  • To explore the role of the cell membrane in hIAPP aggregation and toxicity.

Main Methods:

  • Atomistic molecular dynamics simulations were employed.
  • Simulations involved a full-length hIAPP monomer in contact with various lipid bilayers.
  • NMR experimental data from similar environments were used for comparison.

Main Results:

  • The lipid membrane stabilizes helical conformations of hIAPP, consistent with NMR findings.
  • Varying lipid bilayer compositions lead to distinct equilibrium conformational ensembles of hIAPP.
  • Mixed bilayers with anionic headgroups promote hIAPP conformations adsorbed below the membrane surface.

Conclusions:

  • Lipid membranes significantly influence hIAPP conformation and aggregation propensity.
  • Membrane composition is a critical factor determining hIAPP's structural ensemble.
  • Understanding these interactions is crucial for developing therapeutic strategies against type 2 diabetes.